n-api: remove extra reference from test

[gabrielschulhof]

Checklist

• make -j4 test (UNIX), or vcbuild test (Windows) passes
• tests and/or benchmarks are included
• commit message follows commit guidelines

Affected core subsystem(s)

n-api

[mhdawson]

LGTM

[mhdawson]

CI run: https://ci.nodejs.org/job/node-test-pull-request/12960/

[gabrielschulhof]

https://ci.nodejs.org/job/node-test-commit-arm/13651/nodes=ubuntu1604-arm64_odroid_c2/consoleFull fails in the same way as other builds, such as

https://ci.nodejs.org/job/node-test-commit-arm/13649/nodes=ubuntu1604-arm64_odroid_c2/consoleFull

and

https://ci.nodejs.org/job/node-test-commit-arm/13649/nodes=ubuntu1604-arm64_odroid_c2/consoleFull

I don't think the fact that deps/openssl/openssl/crypto/x509v3/v3_purp.c sometimes fails to compile is an error related to this change. In fact, it seems like the file gets corrupted, because there are stray characters in the input in these builds, whereas in builds like

https://ci.nodejs.org/job/node-test-commit-arm/13650/nodes=ubuntu1604-arm64_odroid_c2/consoleFull

the same file compiles just fine.

../deps/openssl/openssl/crypto/x509v3/v3_purp.c: In function ‘X509_check_akid’:
../deps/openssl/openssl/crypto/x509v3/v3_purp.c:844:7: error: expected expression before ‘if’
   !   (     if&*gen->type == GEN_DIRNAME) {
       ^
../deps/openssl/openssl/crypto/x509v3/v3_purp.c:844:27: error: expected ‘;’ before ‘{’ token
   !   (     if&*gen->type == GEN_DIRNAME) {
                           ^
../deps/openssl/openssl/crypto/x509v3/v3_purp.c:845:7: error: stray ‘\240’ in program
       �       $ nm = gen->d.dipn;
       ^
../deps/openssl/openssl/crypto/x509v3/v3_purp.c:847:7: error: stray ‘`’ in program
       `     }
       ^

[gabrielschulhof]

Landed in d379db3.